Hello, 

I am working on a CentOS7 libvirt hypervisor running Vagrant 2.0.0 and 
using the vagrant box found here: https://app.vagrantup.com/centos/boxes/6.

I am trying to configure a vagrant box with a bridged interface using the 
documentation examples at vagrant-up.com. When I add this line to my 
Vagrantfile:

config.vm.network "public_network", bridge: "br0"


Then do:

vagrant up


I get this error:

Call to virDomainCreateWithFlags failed: Unable to get index for interface 
eth0: No such device


I've had to use this syntax in order for it to work:

config.vm.network "public_network", :dev => "br0", :mode => 'bridge', :type 
=> "bridge"



*I have 2 questions:*

   1. Is the documentation outdated?
   2. When this does work, it creates a second network device (eth1) on the 
   vagrant box which is connected to the host via br0. Eth0 is connected to 
   the host via (vagrant-libvirt). Is there a way to have my bridge as eth0?



Thanks...

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